At 07:30 PM 3/23/00 -0800, you wrote: >Not sure what you mean by running the SX as a non Virtual Perf.??? > Mark, The normal Scenix route is to use the timer to generate a periodic interrupt, within whose ISR you perform all the VP servicing. You use RETIW to return. However, by non-VP, I meant programming the chip like any normal chip, where you have a main code loop and aynchronous external interrupts, such as RS-232 on an I/O pin. Here you use RETI to return. - Dan Michaels